Question

Two cars traveling with the same speed move directly away from one another. One car sounds a horn whose frequency is 436 HzHz and a person in the other car hears a frequency of 390 HzHz.

Part A What is the speed of the cars? the answer is not 20.23 |

Answer #1

Two cars traveling with the same speed move directly away from
one another. One car sounds a horn whose frequency is 422 Hz and a
person in the other car hears a frequency of 385 Hz. What is the
speed of the cars?

Two cars moving with the same speed are approaching each other
from opposite directions. The driver of one of the car blows his
horn, which emits sound with the frequency of 400 Hz. The driver in
the other car hears the frequency of 450 Hz. What is the speed of
the cars if the speed of sound is 340 m/s?

Two automobiles are equipped with the same singlefrequency horn.
When one is at rest and the other is moving toward the first at 19
m/sm/s , the driver at rest hears a beat frequency of 4.0 HzHz .
What is the frequency the horns emit? Assume T=20∘C

A car moving away from an intersection of two one-way streets at
a speed of 15 m/s while a second car approaches the intersection at
a speed of 10 m/s. Calculate the rate of change in the distance D
between the two cars with time at the instant x = 40 m and y = 30
m.

Two cars travel in the same direction along a straight highway,
one at a constant speed of 55 mi/h and the other at 70 mi/h.
(a) Assuming they start at the same point, how much sooner does
the faster car arrive at a destination 14 mi away?
(b) How far must the faster car travel before it has a 15-min lead
on the slower car?

A 740-kg two-stage rocket is traveling at a speed of 6.40×10^3
m/s away from Earth when a predesigned explosion separates the
rocket into two sections of equal mass that then move with a speed
of 2.30×10^3 m/s relative to each other along the original line of
motion.
Part A: What is the speed of each section (relative to Earth)
after the explosion?
Part B: What are the direction of each section (relative to
Earth) after the explosion?
a) both away...

Two cars travel in the same direction along a straight highway,
one at a constant speed of 55 mi/h and the other at 60 mi/h.
(a) Assuming they start at the same point, how much sooner does
the faster car arrive at a destination 14 mi away? min
(b) How far must the faster car travel before it has a 15-min
lead on the slower car? mi

You are in a car (car A) traveling at a constant speed of 72 mph
(miles per hour) when another car (car B) 25 meters ahead of your
swerves into your lane. Car B is traveling at 100 km/hr. In order
to avoid colliding with car B, determine the minimum acceleration
of your car (A).
a) For both cars, sketch acceleration- and velocity-versus-time
graphs. (Be sure to label them.) When sketching a graph, you should
show the rough behavior (i.e.,...

Two cars approach an ice-covered intersection. One car, of mass
1.21 X 10^3 kg, is initially traveling north at 12.1 m/s. The other
car, of mass 1.62 X 10^3 kg, is initially traveling east at 12.1
m/s. The cars reach the intersection at the same instant, collide,
and move off coupled together. Find the velocity of the center of
mass of the two-car system just after the collision.
magnitude: ______
direction: _____ north of east

A
795 kg two-stage rocket is traveling at a speed of 6.90×10^3 m/s
away from earth when a predesigned mass that then move with a speed
of 2.38×10^3 m/s relative to each other along the original line of
motion. How much energy was supplied by the explosion?

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